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CY7C470
CY7C472
CY7C474
4
Switching Characteristics Over the Operating Range[5, 6]
7C470–15
7C472–15
7C474–15
7C470–20
7C472–20
7C474–20
7C470–25
7C472–25
7C474–25
7C470–40
7C472–40
7C474–40
Parameter
Description
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Unit
tCY
Cycle Time
30
30
35
50
ns
tA
Access Time
15
20
25
40
ns
tRV
Recovery Time
15
10
10
10
ns
tPW
Pulse Width
15
20
25
40
ns
tLZR
Read LOW to Low Z
3
3
3
3
ns
tDV
[7]
Valid Data from Read HIGH
3
3
3
3
ns
tHZ
[7]
Read HIGH to High Z
15
15
18
25
ns
tHWZ
Write HIGH to Low Z
5
5
5
5
ns
tSD
Data Set-Up Time
11
12
15
20
ns
tHD
Data Hold Time
0
0
0
0
ns
tEFD
E/F Delay
15
20
25
40
ns
tEFL
MR to E/F LOW
25
30
35
50
ns
tHFD
HF Delay
25
30
35
50
ns
tAFED
PAFE Delay
25
30
35
50
ns
tRAE
Effective Read from
Write HIGH
15
20
25
40
ns
tWAF
Effective Write from
Read HIGH
15
20
25
40
ns
Notes:
5.
Test conditions assume signal transmission time of 5 ns or less, timing reference levels of 1.5V and output loading of the specified IOL/IOH and 30-pF load
capacitance, as in part (a) of AC Test Load and Waveforms, unless otherwise specified.
6.
See the last page of this specification for Group A subgroup testing information.
7.
tHZR and tDVR use capacitance loading as in part (b) of AC Test Loads. tHZR transition is measured at +500 mV from VOL and –500 mV from VOH. tDVR transition is measured
at the 1.5V level. tHWZ and tLZR transition is measured at ±100 mV from the steady state.
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